Romney's Challenge

Two weeks before Election Day, three new national polls of likely voters show the presidential race in a dead heat or give Mitt Romney a slight edge over President Obama.

A Wall Street Journal/NBC News poll and a Public Policy Polling survey have the candidates tied at 47% and 48%, respectively. A third poll from Politico and George Washington University has Mr. Romney leading 49% to 47%. All three polls, however, show Republican...